On the day before the mark of the official start of summer, John Butler Trio will be bringing his sun-laced vibes to the River Stage at Great Plaza.

Groove into summer with John Butler Trio at Penn’s Landing

John Butler of the John Butler Trio performs on stage during the Big Day Out Festival at the Gold Coast Parklands on January 23, 2011 in Gold Coast, Australia. (Photo by Chris Hyde/Getty Images) Getty Images